Digestorum libri
Ex libro LXXXVIII
Dig. 45,1,59Idem libro octagensimo octavo digestorum. Quotiens in diem vel sub condicione oleum quis stipulatur, eius aestimationem eo tempore spectari oportet, quo dies obligationis venit: tunc enim ab eo peti potest: alioquin alias rei captio erit.
Ad Dig. 45,1,59Windscheid: Lehrbuch des Pandektenrechts, 7. Aufl. 1891, Bd. II, § 258, Note 7.The Same, Digest, Book LXXXVIII. Whenever anyone stipulates for oil to be delivered on a certain day, or under some condition, its value should be estimated on the day when the obligation becomes due, for then it can be demanded; otherwise, an advantage will be taken of the promisor.